You'll probably be cool in tanks and want t's in that weather. It's often breezy this time of the year, and a cool breeze as opposed to the warm summer breezes.
Today it was 45 when I got to work at 8:30 am. It's supposed to be even colder tonight and tomorrow than it is today.
It will warrm up ever so slightly next week, there's only one day that's going to be in the high 70's, the rest are upper 60's and low 70's. And at night unless youa re just going from house to car, you'll want a winter coat. DH went running this am in sweats and a hat and mittens.
You're going to want something a lot warmer than shorts on your legs when it's only 48 degrees out at night.
Anne